Patents by Inventor Hans R. Espig

Hans R. Espig has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Shape sorting educational toy
    Patent number: 5139453
    Abstract: A sorting device including an open top container with an invertible sorting member mounted thereover. The sorting member includes multiple funnel-shaped passages therethrough each having, at one end, an enlarged opening and at the second truncated end a specifically configured opening of a size to closely receive and pass therethrough only a correspondingly configured block introduced in either direction through the configured opening.
    Type: Grant
    Filed: March 15, 1991
    Date of Patent: August 18, 1992
    Assignee: Dart Industries Inc.
    Inventors: Brian L. Aiken, Patrick W. Brown, Hans R. Espig
  • Metal/oxygen cells and method for optimizing the active life properties thereof
    Patent number: 4189526
    Abstract: Metal/oxygen cells such as zinc/air cells are provided with optimum active life characteristics by interposing, on the air side of the cell, an oxygen diffusivity-limiting membrane, such as, for example, sintered polytetrafluoroethylene, so that no more oxygen is received than is needed for the current rate required for the intended application.
    Type: Grant
    Filed: May 5, 1978
    Date of Patent: February 19, 1980
    Assignee: Gould Inc.
    Inventors: John W. Cretzmeyer, Hans R. Espig